image bank
Untitled Document

 

Search Images
Browse Images
About Us
Feedback / Help

Image Use

For Teachers

ESWIB Home
ESWorld Home
AGI Home


Photo ID: h32i57Subject: VolcanoesDescription
Active Volcanoes; Cascade Range; EDM; Eruptions; Geologic Hazards; Intrustions; Stratovolcanoes; Theodolite; Uplifts; Volcanic Features; Volcanism; VolcanologyGeologists use a theodolite and an Electronic Distance Meter to measure angles and slope-distances to the Mt. St. Helens lava dome. Changes in these angles and distances are used to calculate 'deformation rates'. The rates often reached as much as 30 feet per hour as magma rose and the dome expanded before extrusion started.
PhotographerLocation
Lyn Topinka

Credit Line: Courtesy USGS Cascade Volcano Observatory
North America; United States; Washington; Mount Saint Helens
Photo Quality | Large 


Information Services |Geoscience Education |Public Policy |Environmental
Geoscience
 |
Publications |Workforce |AGI Events |

agi logo© 2014 All rights reserved. American Geosciences Institute, 4220 King Street, Alexandria, VA 22302-1502.
Please send any comments or problems with this site to: photo@agiweb.org.
Privacy Policy